Rock drill



E. G. GARTIN June; 14, 1932.

ROCK DRILL Filed Oct. 1, 1929 1720622607: 5227261 6? Gafit/n may A; 4-

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W N Q ANN Patented Ja 1'4, 1932 I '-'11 ,86 2,92li I NITED'STATES PATENTOFFICE G. GABTIN, OF CLARE'HONT, NEW HAMPSHIRE, ASSIGNOB '10 SULLIVANMACHINERY COMPANY, A COBPORATION OF .MASSACH'USEI'IS:

ROCK DRILL Application filed October 1,. 1929. Serial No. 896,559.

This invention relates to rock drills, and Fig. 4 is a detail sectionalview taken on more particularly to improved pressure fluid line H ofFig. 1. n I operated feeding mechanism for a rock drill Fig. 5 is adetail sectional view of the feed the mounted rifter type. controllingvalve mechanism shown in Fig.

An object of this invention is to provide 1 with the valve shown inadiflerent position. 55 I an improved rock drill feeding mechanism. Inthis illustrative construction there is Another object is toprovide animproved shown a rock drill of the mounted drifter pressure fluidoperated feeding mechanism ype inc uding a drilling tool 1 having ausual or a rock drill of the mounted drifter type. hammer motor 2 whichis adaptedfio per nsm A further object is to provide an improved sw yWillate d1'111 Stee1 AS lsusllfil at rock drill feeding mechanis i l dig a IOCk'dllllS of the drifter type the cylinder pressure fluid operatedfeeding motor of the 0f the fl j M 1 2 18 pr v d d wi h latcylinder andpiston type and improved cona y p i g gm m mb rs 01 glbs 4} nectionsbetween the feeding motor and the d y mounted- P ral l gnldeways ,5

15 drilling tool whereby a relatively long feed j fi 'lntegral wlijh gqShgfl 65' is obtained withoutmaterially increasing the vg Shell 18 pr ldd with a usual sw vel over-all length of the drill. A further ob p h 7 lf to he h' p In a ject is to provide in such a drill an improvedsultahle tmhhloh 11101111151111; of h tnPoh ressure fluid operatedfeeding motor of the 1111111 l known nn I11 the P 20 cylinder and pistontype and improved rack f h 'h h y formed 1 and pinion mechanism betweenthe feeding h gulde sheuhhd @Tovlded motor and the drilling tool wherebythe rate W a hg hf bore 9 lllwhlch alfeed of feeding movement of thefeed motor is P sh 10.13 B y h e substantially multiplied. A furtherobject cyhhdehls provldefl W h haad 11 n is to provide a drifter typerock drill having teg'ml Wlth the elude Shell, h a detachhhle, 75

a relativelylong feed while an exceedingly rear head 1 l Secured q e gfi. compact structure is retained. Yet another h hh t a the feed Plstoh13 object is to provide an improved pressure provldhd Wlth a tubularffied P 13 fluidoperated. feeding mechanism foruse exthhdlhg through anopehlhg 14111 hh front m with a drifter type rock drill of a standard sa 11 i l' formed i construction. 7 These and other objects and f hdepehdmg ears bosses 15 P advanta es of this invention will, however, Pi transverse bolt 16 as clearly shown, hereina more fully appeat in Fig.&. J ournaled on the boltl6 1s a spur In the accomfianying drawing thereis pinion 17mesh1ngw1ththeteethof astatlonas shown forpurposes ofillustration one form My rack 18 formed mtegr wlth the gnde r shell andarranged in advance of the feed i fi z g fg l l assume m P cylinder.Telescopically arranged within 1 a1 f d the tubular piston rod 13isaslidable rod 19 ;1S a 2 i w F having formed thereon rack teeth20-also WP? rock h h mcqrpommd therhm meshing'with the teeth oi the spurpinion 9o 9 11116 s a v mi the p f f h 17. This rod 19 is secured by anut and m h m mf h h helhg screw connection 21 to. a clamp member 22shown par lal y n u m detalls rigidly clamped to the front end of the ofcon r m drilling tool by means of a transverse clamp-- F gis atransverse vertical sectional in bolt 23. This rodisheld againstrotationview taken s bs antially n n 2-.- of "re ative to the clamp member 22bymeans-of Fig. 1. r asquared portion24thereon fittingasqu Fig. 3 is atransverse vertical sectional ope 25inthe clamp.

view taken subdaantially on-line 3-3 The mproved fluid distributionmanner??? f Fig. 1. feed cylinder COmPI'ISBS a throttle 109' port 31with the cylinder bore at the front side of the feed piston, while thepassage 29 communicates with the feed cylinder bore at the rear sideof'the piston. Traversing the wall of the throttle valve is a port 32communicating with a fluid supply chamber 33 formed centrally within thevalve. Also formed on the exterior periphery of the valve arecircumferential grooves 34 and 35, while exhaust ports 36 and 37 connectthe bore 27 to atmosphere. When the feed control valve .26 is in theposition shown in Fig. 5, a pressure fluid is admitted from the supplychamberi33 in the valve through the port 32 and passage 29 to the rearend of the cylinder bore at the rear side ,of the feed piston. At thesame time the pressure fluid within the front end of the cylinder boreis connected to exhaust through port 31, passage 30, groove 35 on thevalve, and exhaustport 37 The pressure fluid acting on the rear pressurearea of the feed piston 10 causes the latter to move forward within thecylinder bore and carry with it the gear 17 which meshes with thestationary rack 18 and the rack 20 on the rod 19. This gear reacting onthe stationary rack rotates in a. clockwise direction as viewed in Fig.1 and as a result this gear, due to its meshing engagement with the rack20,.causes the rod 19 to be moved forward at a speed substantiall twicethat of the rate of movement of the fl ed piston. As a result thedrilling tool 1 which is connected to the rod 19 by clamp member 22 isfed forward on the guideways on the guide shell, the rack and pinionconstruction between the feed piston and the drill causing the latter tobe fed a distance substantially twice the distance of travel of the feedpiston 10. When the, drilling tool is fed to its extreme limit offorward movement relative to the guide shell, the feed control valve 26is turned into the position shown in Fig. 1,

thereby connecting the cylinder bore at the rear side of the piston toexhaust through passage 29, groove 34 in the valve, and exhaust port36,while the cylinder bore at the front side of the feed piston isconnected to e source of pressure fluid supply through port 31, passage30 and port 32 communicatwith the pressure chamber 33 in the v ve As aresult the pressure fluid acting on the front pressure area of the feedpiston causes the latter to move rearward, thereby feeding the drillingto'ol rearward in the guides on the guide shell to the position shown inFig. 1. j

,As aresult of this invention an improved pressure fluid operatedfeeding mechanism is provided for a rock drill of the mounted drlftertype wherein a relatively long feed is obtained without materiallyincreasing the over-all length of the drill. It will further be notedthat by the telescopic arrangement of the tubular feed piston rod andthe sliding rack an extremely compact feeding mechanism is obtained. Itwill further be noted that an improved pressure fluid operated feedingmechanism is provided for a drifter type rock drill which is adapted touse with a rock' drill of a standard design. These and otheruses andadvantages of this invention other forms without departing fromitsspinit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a rock drill, a guide shell, a drilling tool guided thereon,pressure fluid operated mechanism for feeding said tool relative to saidshell including relatively reciprocable cylinder and piston elements oneof which has a chamber therein, connections between one of said feedingelements and the drilling tool including a rack secured to said shell, apinion carried by and movable with one'of said feeding elements andmeshing with said rack, a second rack with which said pinion meshes and.arranged to extend within said chamber in said feeding element, and aconnection between one end of said last mentioned rack and the drillingtool.

2. In a rock drill, a guide shell, a drilling tool guided thereon,pressure fluid operated mechanism forfeeding said tool relative to saidshell including relatively reciprocable cylinder and piston elements oneof which has a chamber therein, connections between one of said fee'dingelements and the drilling tool including a stationary rack secured tothe guide shell, a pinion carried by and movable with. one of saidfeeding elements and meshing with said rack, a sliding rack with whichsaid pinion meshes and arranged to extend within said chamber, and aconnection between the forward end of said sliding rack and the frontend of the drilling tool.

3. In a rock drill, a. guide shell, a drilling tool guided thereon,pressure fluid operated said shel feeding elements,

"elements and meshing with said racks.

5. In a rock drill, a guide shell, a drilling tool guidedthereon,pressure fluid operated mechanism for feeding said tool relative to saidshell including a stationary feed cylinder and a feed pistonreciprocably mounted thereon, said feed piston having a tubular piston Yrod, and connections between said Y feed piston and the tool including asliding rack telescopically arranged within said piston rod, astationary rack secured to the guide vshell, and a pinion carried by andmovable with said piston and meshing with said racks. d. In a rockdrill, a guide shell, a drillin tool guided thereon, pressure fluidoperate mechanism for feeding said tool relative to said shell includingrelatively reciprocable feeding elements, and connections between one ofsaid elements and the drilling tool including cooperating toothedelements one of which iscoaXially arranged with and telescopicallyarranged wit feeding elements during the feeding operation, andconnections between one of said toothed elements and the drillingtool.

7. In a rock drill, a guide shell, a drilling tool guided thereon,pressure which is telescopically arranged within oneof said feedingelements, andconnections be- "tween one of said toothed elements and thedrilling tool. v V 8. In a rock a guide shell, a drilling pressure fluidoperated mechanism vfor feeding the tool relative to I said shellincluding relatively reciprocable tween one of. said cylinder and pistonelements, connections be- I lements and said tool including a rackarranged to extend within one of said elements, a stationary rackcarried by the guide shell in'advance of said and. a pinion carried by 5meshing h aish cke-sedg guide shell, a drilling one of said feedingelements and movable relative to said elements and the tool insaid shellincluding 9. In a rock drill, a guide shell, adrilling tool guidedmechanlsm for feeding said tool relative to said shell includingrelatively reciprocable cylinder and pist tions between one of saidfeeding elements 11 elements, and connecand' said tool including asliding rac'k telescopically arranged with one of said feeding elements,astationary rack secured to said g ab e with said reciprocable feedingelement and meshing withsaid rac 10. In a rock drill, a guide shell, adrilling tool guided thereon, pressure fluid operated'mechanism forfeeding thetool rela tive to feed piston reciprocably mounted thereinand having a hollow piston rod, and connections betweensaid feed pistonand the tool including,a sliding rack telescopically arranged withinsaid hollow piston rod and guided by the latter, said rack beingslidable relative to said piston and cylinder, a stationary rack securedto said guide shell, and a pinion carried by and movable with saidtubular piston rod and meshing with said racks.

11.. In a rock drill, a guide shell, a drilling tool guided thereon,pressure fluid operated mechanism for feeding said tool relative to saidshell including relatively reciprocable feeding elements one of whichhas a tubular portion, andconnections feeding elements and said toolincluding co operating relatively movable toothed elements one of whichis telescopically arranged within said tubular portion, and connectionsbetween one of said toothed elements and the drilling tool.

12. In a rock drill, a guide shell, a drilling tool guided thereon,pressure fluid operated mechanism for feeding said tool relative to saidshell including relatively reciprocable feeding elements one of whichhas a tubular portion, and connections between one of said feedingelements and the tool including a sliding elementtelescopically arrangedwithin said tubular portion, a cooperating stationary element carried bythe'guide shell, and a rotatable element carried by and movable with oneof said feeding elements and cooperating with sliding and stationaryelements. Y e

"13. In a rock drill, a guide shell, a

mechanism for feeding said tool relative to latively reciprocablecylinder and one of said.

thereon, pressure fluid operated iston elements, and connections. 1between one of said elements and the uli de shell, and a pinion carriedby and movj said shell including a feed cylinder, a

between one of said member, amember cartionary element and rotatablethrough its coperation with said element on movement of said lastmentioned feeding element and a, member secured to the drillingtool andinter- 5 enga 'ng with said rotatable member, said mem r secured to thedrilling tool bein telescopically arranged within one of said feedinelements.

14. n a rock drill, a guide shell, a drillingtool guided thereon,pressure fluid operated mechanism for feeding saidv tool relative tosaid shell including relatively reciprocabl'e cylinder and pistonelements, and connections between said piston element and the drillingtool including a hollow piston rod, a

member secured to said drilling tool and telescopically arranged withrespect to said piston rod, :1 member carriedby said piston rod outsidesaid cylinder and interengaging.

with said telescopically arranged member and operative .on rotation toeffect longitudinal movement ofthe latter and of the drilling tool, andmeans for efi'ecting rotation of said rotatable member including astationary member extending longitudinally of said shell relative towhich said rotatable member has movement on reciprocation of said feedpiston. y

15. In a rock drill, a guide shell-,a drilling tool guided, thereon,pressure fluid operated mechanism for feeding said tool relative to saidshell including relatively reciprocable feeding elements, andconnections between one of said elements and the drilling tool includingcooperating toothed elements one of which has a longitudinal toothedportion 00- axial with and telescopically arranged within one of saidfeedin elements, and c0nnections between one 0? said toothed elements 40and the drilling tool.

In testimony whereof I aflix my signature;

ELMER G. GARTIN.

